Anyone has Cocoa tutorials or simple game sample code?

I've grown interest in Cocoa and just got Project Builder, so I want to try my hand at it. I know METAL, but I know it's very different. What I need is some tutorials on the basics of Objective-C or sample codes of simple games.

True, but (sadly) the original cocoa port by Brian Blackburn of the tutorials are not fully compatible with OS X 10.2 and up.

I'd recommend having a look at the new cocoa openGL basecode (always on nehe.gamedev.net). Wich shows a much more efficient way of setting up the openGl context, and also contains a basic Vector class, keyboard event catching and whatnot. Alas, the tutorials aren't on it yet, but it's a good way to get experience I guess.